drive fails to initialize

Forum discussion tagged with drive fails to initialize.
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    Question Swapped PCB (and BIOS) on Hard Disk - Cannot initialize Drive

    Hello! I was replacing the PSU in a build and assumed the SATA power connectors were interchangeable since it was the same brand PSU. Upon booting two of my (previously working) HDD were no longer recognized (could not see them in disk management etc.). Tried plugging them into another computer...